Minister closely confined outside bar (7)
I believe the answer is:
prevent
'bar' is the definition.
(I know that bar has the is a more specific form of the action block)
'minister closely confined outside' is the wordplay.
'minister' becomes 'rev' (short for reverend).
'closely confined' becomes 'pent' (I've seen this in another clue).
'outside' indicates putting letters inside.
'rev' put into 'pent' is 'PREVENT'.
(Other definitions for prevent that I've seen before include "Stop (an action)" , "Keep from happening" , "Keep from arising" , "Thwart" , "Avert, hinder" .)